Moisture-proof and dust-proof ventilation type active power filter

Abstract

The invention provides a moisture-proof and dust-proof ventilation type active power filter, and relates to the technical field of electric power. The moisture-proof and dust-proof ventilation type active power filter comprises a microcomputer controller, an installation box, a dehumidification box and a filter body. A second fan sucks away air in the mounting box, air enters through multiple sets of ventilation windows at the same time, the purpose of ventilation and heat dissipation is achieved, a filter screen is arranged on the inner side wall of each ventilation window and can play a dustproof role in the ventilation process, dehumidification particles adsorb moisture in the mounting box to play a damp-proof role, and a first fan blows the filter screens in the reverse direction; the filter screen is subjected to dust removal and regeneration, the manual maintenance frequency is effectively reduced, moisture absorption saturated dehumidification particles rotate to the position above the air inlet hole, the microcomputer controller controls the electric heating wire to be powered on, heated air is blown into the corresponding dehumidification cavity through the second fan, and therefore the purposes of heating and regeneration of the dehumidification particles are achieved. And the manual maintenance frequency is further reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electric power, in particular to a moisture-proof, dust-proof and ventilated active power filter. Background Art

[0002] Active power filter is a new type of power electronic device used to dynamically suppress harmonics and compensate for reactive power. It can quickly track and compensate for harmonics of different sizes and frequencies. It is called active because it is relative to passive LC filters that can only passively absorb harmonics of fixed frequency and size. APF can sample the load current and separate each harmonic and reactive power, control and actively output the size, frequency and phase of the current, and respond quickly to offset the corresponding current in the load, thereby achieving dynamic tracking compensation, and can compensate for both harmonics and reactive power and imbalance.

[0003] For example, the prior art discloses a moisture-proof and dust-proof ventilation type active power filter, which is provided with a circular groove on the front plate of the device to place a circular felt net, and the components are installed in the circular felt net, and a threaded column is provided on one side of the circular felt net, and a threaded cap is provided on the threaded column, and a fixing plate is provided on the threaded cap, and a motor is provided on the fixing plate, and a fan blade is provided at the output end of the motor, and the motor can blow air to the component position when it rotates, and an air outlet is provided on the rear shell, and a rotating rod connected to the air plate is provided on the air outlet. The disclosed technology states that when dust falls on the component, the dust can be blown onto the felt net by blowing air, and the device as a whole can be made dry by blowing air to prevent the device from getting damp. In fact, the fan blade in the technology will blow dust in the air to the component, and cannot keep it clean. Especially when the air is humid, the moisture will make the dust stick to the surface of the component, affecting the heat dissipation;

[0004] In addition, there is a public technology that proposes an active power filter, including a box body and a cabinet body fixedly connected to the upper end of the box body, a side door is hinged on the side wall of the cabinet body, a filter device is installed in the cabinet body, and its cooling fan is actually directly connected to the outside, which leads to the defects existing in the above public technology, that is, it can only achieve ventilation, but cannot prevent moisture and dust. There is also a technology that proposes to place a dehumidification device inside the cabinet body and set a filter screen at the air inlet window, but it usually does not have a regeneration function and still requires frequent manual maintenance;

[0005] In summary, it is necessary to further improve the active power filter to achieve the purpose of moisture-proof, dust-proof and ventilation while reducing the number of manual maintenance times. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a moisture-proof, dust-proof and ventilated active power filter, which solves the problem that the active power filter in the prior art cannot take into account both moisture-proof, dust-proof and ventilated properties and the problem of frequent manual maintenance.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a moisture-proof and dust-proof ventilated active power filter, comprising a microcomputer controller, an installation box, a dehumidification box and a filter body, wherein the filter body is arranged inside the installation box, the dehumidification box is fixedly connected to the rear wall of the installation box, multiple groups of ventilation windows are fixedly connected on the left and right sides of the installation box, multiple groups of ventilation windows are fixedly connected to the inner walls of the ventilation windows, the inner wall of the installation box is provided with a first blowing structure for blowing air to dissipate heat and reverse cleaning of the filter, the inner wall of the dehumidification box is provided with a rotating chamber, the front wall of the dehumidification box and the rear wall of the installation box are both provided with openings, the rotating chamber is connected to the inside of the installation box through two groups of openings, a rotating drum is rotatably connected inside the rotating chamber, and a motor for driving the rotating drum to rotate is provided on the top of the dehumidification box.

[0008] Preferably, the outer circumferential wall of the rotating drum is provided with three groups of dehumidification chambers, the three groups of dehumidification chambers are equally distributed in a circle with the axis of the rotating drum as the center, the inner wall of the dehumidification chamber and close to the outer circumferential wall of the rotating drum is provided with a second ventilation net, the dehumidification chamber is provided with dehumidification particles for absorbing moisture, the inner wall of the rotating drum is provided with three groups of first ventilation holes which are vertically connected, the three groups of first ventilation holes are equally distributed in a circle with the axis of the rotating drum as the center, and the three groups of first ventilation holes are respectively located at any two adjacent groups of dehumidification chambers in the circumferential direction of the three groups of dehumidification chambers in a top view. Between the wet chambers, an air duct is fixedly connected to the rear wall of the installation box and located below the dehumidification box. A heating pipe and a mounting shell are fixedly connected in sequence from bottom to top between the end of the air duct away from the installation box and the lower wall of the dehumidification box. A heating structure for heating air to regenerate dehumidification particles is arranged inside the heating pipe. A second blowing structure for sucking air inside the installation box into the dehumidification box is arranged inside the installation shell. A temperature detection structure for detecting temperature is arranged on the inner wall of the installation box. A humidity detection structure for detecting humidity is arranged on the outer wall of the air duct.

[0009] Preferably, the inner upper wall and the inner lower wall of the dehumidification chamber are respectively provided with a third ventilation hole and a second ventilation hole which are connected with the upper wall and the lower wall of the rotating drum. The third ventilation hole and the second ventilation hole are connected vertically and the inner wall is provided with a first ventilation net.

[0010] Preferably, the upper wall and lower wall of the dehumidification box are respectively provided with exhaust windows and air inlet holes, and the exhaust windows and air inlet holes are opposite to each other in vertical direction and are opposite to any one of the three groups of first air holes or any one of the three groups of third air holes in vertical direction. The upper wall of the dehumidification box is located at the exhaust window part and is rotatably connected with a cover plate through a hinge, and the mounting shell is opposite to the air inlet hole in vertical direction.

[0011] Preferably, the first air blowing structure includes multiple groups of first fans, and the multiple groups of first fans are all arranged on the inner wall of the installation box and are respectively opposite to the multiple groups of ventilation windows inside and outside, and the blowing directions of the multiple groups of first fans are all towards the corresponding ventilation windows.

[0012] Preferably, the second air blowing structure is a second fan, the second fan is arranged on the inner wall of the mounting shell, and the air blowing direction of the second fan is upward.

[0013] Preferably, the heating structure is an electric heating wire, and the electric heating wire is arranged on the inner wall of the heating tube.

[0014] Preferably, the temperature detection is a temperature sensor, and the temperature sensor is fixedly connected to the inner wall of the installation box through a bracket.

[0015] Preferably, the humidity detection structure is a humidity sensor, which is fixedly connected to the outer wall of the air duct and a detection end of the humidity sensor penetrates the outer wall of the air duct and extends into the interior of the air duct.

[0016] Preferably, the dehumidifying particles can be any one of silica gel drying particles and calcium chloride hygroscopic particles.

[0017] The present invention provides a moisture-proof, dust-proof and ventilated active power filter. It has the following beneficial effects:

[0018] 1. Compared with the prior art, the moisture-proof and dust-proof ventilation active power filter is provided with multiple sets of ventilation windows, and the air inside the installation box is sucked away by the second fan, and the air is sucked away and enters through the multiple sets of ventilation windows at the same time, so as to achieve the purpose of ventilation and heat dissipation. The filter net is arranged on the inner wall of the ventilation window to play a dust-proof role in the ventilation process, and the dehumidification particles in a group of dehumidification cavities facing the inside of the installation box absorb the moisture inside the installation box, so as to play a moisture-proof role.

[0019] 2. Compared with the prior art, the moisture-proof, dust-proof and ventilated active power filter can use multiple sets of first fans to improve the heat dissipation effect, and can also be used alone to blow the filter in reverse to remove dust and regenerate the filter, thereby increasing the service life of the filter and effectively reducing the number of manual maintenance times.

[0020] 3. Compared with the prior art, the moisture-proof and dust-proof ventilation active power filter has a humidity sensor in the air duct. When it is detected that the humidity of the passing air exceeds the set value, the motor rotates the drum to switch the positions of the three groups of dehumidification chambers to rotate the moisture-saturated dehumidification particles above the air inlet. The electric heating wire is energized through the microcomputer controller, and the heated air is blown into the corresponding dehumidification chamber through the second fan to achieve the purpose of heating and regenerating the dehumidification particles. The heated hot and humid air pushes open the cover and is discharged outward, further reducing the number of manual maintenance times. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a partial cross-sectional view of the top surface of the installation box, the ventilation window and the first fan connection structure of the present invention;

[0023] Figure 3 It is a top view schematic diagram of the connection structure of the dehumidifier box, the motor and the cover plate of the present invention;

[0024] Figure 4 It is a partial cross-sectional view of the top view of the dehumidification box and the rotary drum connection structure of the present invention;

[0025] Figure 5 It is a partial cross-sectional view of the top view of the connection structure of the dehumidification box, the rotating drum, the dehumidification particles and the second ventilation net of the present invention;

[0026] Figure 6 It is a partial cross-sectional view of the internal structure of the dehumidification box of the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the rotary drum of the present invention;

[0028] Figure 8 It is a side schematic diagram of the connection structure of the dehumidification box, the installation box, the air duct, the installation shell and the heating tube of the present invention;

[0029] Fig. 9 It is a top view schematic diagram of the internal structure of the heating tube of the present invention.

[0030] Among them, 1. installation box; 2. ventilation window; 3. filter net; 4. dehumidification box; 401, opening; 402, air inlet; 5. motor; 6. cover plate; 7. first fan; 8. bracket; 9. temperature sensor; 10. exhaust window; 11. rotating drum; 12. first ventilation hole; 13. dehumidification chamber; 14. second ventilation hole; 15. third ventilation hole; 16. first ventilation net; 17. second ventilation net; 18. dehumidification particles; 19. installation shell; 20. second fan; 21. heating tube; 22. air duct; 23. humidity sensor; 24. electric heating wire. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example:

[0033] like Figures 1 to 9 As shown, an embodiment of the present invention provides a moisture-proof and dust-proof ventilation type active power filter, including a microcomputer controller, an installation box 1, a dehumidification box 4 and a filter body, the filter body is arranged inside the installation box 1, the dehumidification box 4 is fixedly connected to the rear wall of the installation box 1, and the left and right sides of the installation box 1 are fixedly connected to multiple groups of ventilation windows 2. In this embodiment, each connection part is sealed by a common sealing ring and a sealing gasket on the market, and the sealing structure is all prior art, which will not be described in detail here;

[0034] In order to achieve the purpose of ventilation and dust prevention, the inner walls of the multiple sets of ventilation windows 2 are fixedly connected with filter screens 3. The multiple sets of ventilation windows 2 can achieve better ventilation and heat dissipation effects, and the filter screens 3 can play a better dust prevention role during ventilation;

[0035] In order to reduce the number of manual maintenance times of the filter 3, the inner wall of the installation box 1 is provided with a first blowing structure for blowing air to dissipate heat and reversely clean the filter 3. The first blowing structure includes multiple groups of first fans 7. The multiple groups of first fans 7 are all arranged on the inner wall of the installation box 1 and are respectively opposite to the multiple groups of ventilation windows 2 in the inside and outside. The blowing directions of the multiple groups of first fans 7 are all blowing towards the corresponding ventilation windows 2. The first fans 7 can be used for heat dissipation and can also be used to reversely blow off the dust adsorbed on the filter 3, thereby increasing the service life of the filter 3.

[0036] In order to realize the rotation of the drum 11, a rotating cavity is provided on the inner wall of the dehumidification box 4, and openings 401 are provided on the front wall of the dehumidification box 4 and the rear wall of the installation box 1. The rotating cavity is connected to the inside of the installation box 1 through two groups of openings 401. The rotating cavity is rotatably connected with the drum 11. A motor 5 for driving the drum 11 to rotate is provided on the top of the dehumidification box 4. The motor 5 is controlled by a microcomputer controller. When started, it rotates sixty degrees each time, driving the three groups of dehumidification chambers 13 and the three groups of first vents 12 to switch positions. The cyclic rotation can realize the three groups of dehumidification chambers 13 to switch between the working state, the regeneration state and the waiting state in turn.

[0037] In order to dehumidify the inside of the installation box 1, three groups of dehumidification chambers 13 are arranged on the outer wall of the circumference of the drum 11, and the three groups of dehumidification chambers 13 are equally distributed in a circle with the axis of the drum 11 as the center. A second ventilation net 17 is arranged on the inner wall of the dehumidification chamber 13 and close to the outer wall of the circumference of the drum 11. Dehumidification particles 18 for absorbing moisture are arranged inside the dehumidification chamber 13. The inner upper wall and the inner lower wall of the dehumidification chamber 13 are respectively provided with a third ventilation hole 15 and a second ventilation hole 14 which are connected with the upper wall and the lower wall of the drum 11. The third ventilation hole 15 and the second ventilation hole 14 are connected up and down and the inner wall is provided with a first ventilation net 16. The upper wall and the lower wall of the dehumidification box 4 The wall is respectively provided with an exhaust window 10 and an air inlet 402, the exhaust window 10 and the air inlet 402 are opposite to each other in the upper and lower parts and are opposite to any one of the three groups of first air vents 12 or any one of the three groups of third air vents 15 in the upper and lower parts, the upper wall of the dehumidification box 4 and the cover plate 6 is connected to the mouth of the exhaust window 10 by a hinge, the installation shell 19 is opposite to the air inlet 402 in the upper and lower parts, the dehumidification particles 18 can be any one of silica gel drying particles and calcium chloride hygroscopic particles, both of which have strong hygroscopicity and can be regenerated by heating, so as to realize the effect of recycling, and effectively control the humidity inside the installation box 1;

[0038] In order to continuously ventilate and dissipate heat inside the installation box 1 when the dehumidification particles 18 are not regenerated, three groups of first vent holes 12 that are connected vertically are arranged on the inner wall of the drum 11. The three groups of first vent holes 12 are equally distributed in a circle with the axis of the drum 11 as the center. The three groups of first vent holes 12 are respectively located between any two adjacent groups of dehumidification chambers 13 in the circumferential direction of the three groups of dehumidification chambers 13 in a top view. When the dehumidification particles 18 are not regenerated, one of the three groups of first vent holes 12 is moved between the air inlet hole 402 and the exhaust window 10 through the rotation of the drum 11. The hot air inside the installation box 1 extracted by the second fan 20 is discharged outward through the air inlet hole 402, the first vent holes 12 and the exhaust window 10 after the cover plate 6 is opened. When no air is discharged from the exhaust window 10, the cover plate 6 covers the exhaust window 10 by its own weight, which can play a dust-proof role.

[0039] In order to heat the air, an air duct 22 is fixedly connected to the rear wall of the installation box 1 and located below the dehumidification box 4. A heating tube 21 and an installation shell 19 are fixedly connected in sequence from bottom to top between the end of the air duct 22 away from the installation box 1 and the lower wall of the dehumidification box 4. A heating structure for heating the air to regenerate the dehumidification particles 18 is arranged inside the heating tube 21. The heating structure is an electric heating wire 24. The electric heating wire 24 is arranged on the inner wall of the heating tube 21. When the dehumidification particles 18 need to be heated and regenerated, the microcomputer controller controls the electric heating wire 24 to be energized to heat the surrounding air. The heated air is sent into the corresponding dehumidification chamber 13 through the second fan 20 to heat and regenerate the dehumidification particles 18.

[0040] In order to achieve the purpose of ventilation, a second blowing structure for sucking the air inside the installation box 1 and sending it into the dehumidification box 4 is arranged inside the installation shell 19. The second blowing structure is a second fan 20. The second fan 20 is arranged on the inner wall of the installation shell 19. The blowing direction of the second fan 20 is upward. The second fan 20 draws away the heated air inside the installation box 1, and at the same time, the air is taken in through the multiple sets of ventilation windows 2 to achieve the purpose of ventilation and heat dissipation.

[0041] In order to monitor the humidity and temperature inside the installation box 1, the inner wall of the installation box 1 is provided with a temperature detection structure for detecting the temperature, and the outer wall of the air duct 22 is provided with a humidity detection structure for detecting the humidity. The temperature detection is a temperature sensor 9, and the temperature sensor 9 is fixedly connected to the inner wall of the installation box 1 through a bracket 8. The humidity detection structure is a humidity sensor 23, and the humidity sensor 23 is fixedly connected to the outer wall of the air duct 22 and the detection end of the humidity sensor 23 passes through the outer wall of the air duct 22 and extends into the air duct 22. The temperature sensor 9 detects the temperature condition inside the installation box 1. Under normal circumstances, ventilation and heat dissipation are only performed through the second fan 20. When the temperature is too high, all the first fans 7 located on the same side of the multiple groups of first fans 7 are started to achieve efficient heat dissipation. The humidity sensor 23 is used to detect the humidity condition inside the installation box 1, and the humidity condition can feedback the moisture absorption saturation degree of the dehumidification particles 18 that are working.

[0042] Working principle: multiple groups of ventilation windows 2 can achieve better ventilation and heat dissipation effects. During ventilation, the filter screen 3 can play a better dust-proof role. The first fan 7 can be used for heat dissipation, and can also be used to blow off the dust adsorbed on the filter screen 3 in the opposite direction, thereby increasing the service life of the filter screen 3. The motor 5 is controlled by a microcomputer controller. When started, it rotates sixty degrees each time, driving the three groups of dehumidification chambers 13 and the three groups of first air vents 12 to switch positions. The circular rotation can realize the three groups of dehumidification chambers 13 to switch between the working state, the regeneration state and the waiting state in turn. The dehumidification particles 18 can be any one of silica gel drying particles and calcium chloride hygroscopic particles. Both silica gel drying particles and calcium chloride hygroscopic particles have strong hygroscopicity and can be regenerated by heating, so as to achieve the effect of recycling and effectively control the humidity inside the installation box 1. When the dehumidification particles 18 are not regenerated, one of the three groups of first air vents 12 is moved between the air inlet 402 and the exhaust window 10 through the rotation of the drum 11, and the heat inside the installation box 1 extracted by the second fan 20 is The air is discharged outward through the air inlet 402, the first air vent 12 and the exhaust window 10, and then the cover plate 6 is opened. When there is no air discharged from the exhaust window 10, the cover plate 6 covers the exhaust window 10 by its own weight, which can play a dust-proof role. When the dehumidification particles 18 need to be heated and regenerated, the microcomputer controller controls the electric heating wire 24 to energize to heat the surrounding air. The heated air is sent into the corresponding dehumidification chamber 13 through the second fan 20 to heat and regenerate the dehumidification particles 18. The second fan 20 draws away the heated air inside the installation box 1, and at the same time, the air is introduced through multiple groups of ventilation windows 2 to achieve the purpose of ventilation and heat dissipation. The temperature sensor 9 detects the temperature inside the installation box 1. Under normal circumstances, ventilation and heat dissipation are only performed through the second fan 20. When the temperature is too high, all the first fans 7 located on the same side of the multiple groups of first fans 7 are started to achieve efficient heat dissipation. The humidity sensor 23 is used to detect the humidity inside the installation box 1. The humidity condition can feedback the moisture absorption saturation degree of the working dehumidification particles 18.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A moisture-proof, dust-proof and ventilated active power filter, characterized in that: The invention comprises a microcomputer controller, an installation box (1), a dehumidification box (4) and a filter body, wherein the filter body is arranged inside the installation box (1), the dehumidification box (4) is fixedly connected to the rear wall of the installation box (1), a plurality of groups of ventilation windows (2) are fixedly connected to the left and right sides of the installation box (1), the inner walls of the plurality of groups of ventilation windows (2) are fixedly connected to filter screens (3), the inner wall of the installation box (1) is provided with a first blowing structure for blowing air to dissipate heat and reversely clean the filter screen (3), the inner wall of the dehumidification box (4) is provided with a rotating chamber, the front wall of the dehumidification box (4) and the rear wall of the installation box (1) are both provided with openings (401), the rotating chamber is connected to the inside of the installation box (1) through two groups of openings (401), a rotating drum (11) is rotatably connected inside the rotating chamber, and a motor (5) for driving the rotating drum (11) to rotate is provided at the top of the dehumidification box (4).

2. A moisture-proof, dust-proof and ventilated active power filter according to claim 1, characterized in that: The outer circumferential wall of the rotary drum (11) is provided with three groups of dehumidification chambers (13), and the three groups of dehumidification chambers (13) are equally distributed in a circle with the axis of the rotary drum (11) as the center. A second ventilation net (17) is provided on the inner wall of the dehumidification chamber (13) and close to the outer circumferential wall of the rotary drum (11). Dehumidification particles (18) for absorbing moisture are provided inside the dehumidification chamber (13). The inner wall of the rotary drum (11) is provided with three groups of first ventilation holes (12) which are connected vertically. The three groups of first ventilation holes (12) are equally distributed in a circle with the axis of the rotary drum (11) as the center. The three groups of first ventilation holes (12) are respectively located at any two adjacent groups of dehumidification chambers (13) in the circumferential direction of the three groups of dehumidification chambers (13) in a top view projection. The installation box (1) is provided between the chamber (13), the rear wall of the installation box (1) and below the dehumidification box (4) is fixedly connected with an air duct (22), the end of the air duct (22) away from the installation box (1) and the lower wall of the dehumidification box (4) are fixedly connected with a heating tube (21) and an installation shell (19) in sequence from bottom to top, the heating tube (21) is provided with a heating structure for heating air so as to regenerate the dehumidification particles (18), the installation shell (19) is provided with a second blowing structure for sucking the air inside the installation box (1) and sending it into the dehumidification box (4), the inner wall of the installation box (1) is provided with a temperature detection structure for detecting the temperature, and the outer wall of the air duct (22) is provided with a humidity detection structure for detecting the humidity.

3. A moisture-proof, dust-proof and ventilated active power filter according to claim 2, characterized in that: The inner upper wall and the inner lower wall of the dehumidification chamber (13) are respectively provided with a third ventilation hole (15) and a second ventilation hole (14) which are connected with the upper wall and the lower wall of the rotating drum (11); the third ventilation hole (15) and the second ventilation hole (14) are connected vertically and the inner walls are both provided with a first ventilation net (16).

4. A moisture-proof, dust-proof and ventilated active power filter according to claim 3, characterized in that: The upper wall and lower wall of the dehumidification box (4) are respectively provided with an exhaust window (10) and an air inlet (402); the exhaust window (10) and the air inlet (402) are opposite to each other in vertical direction and are opposite to any one of the three groups of first air vents (12) or any one of the three groups of third air vents (15); the upper wall of the dehumidification box (4) and the mouth of the exhaust window (10) are connected to a cover plate (6) by a hinge, and the mounting shell (19) is opposite to the air inlet (402) in vertical direction.

5. A moisture-proof, dust-proof and ventilated active power filter according to claim 4, characterized in that: The first air blowing structure comprises a plurality of groups of first fans (7), the plurality of groups of first fans (7) being arranged on the inner wall of the installation box (1) and respectively facing the plurality of groups of ventilation windows (2) inside and outside, and the blowing directions of the plurality of groups of first fans (7) are all towards the corresponding ventilation windows (2).

6. A moisture-proof, dust-proof and ventilated active power filter according to claim 5, characterized in that: The second air blowing structure is a second fan (20), the second fan (20) is arranged on the inner side wall of the mounting shell (19), and the blowing direction of the second fan (20) is upward.

7. A moisture-proof, dust-proof and ventilated active power filter according to claim 6, characterized in that: The heating structure is an electric heating wire (24), and the electric heating wire (24) is arranged on the inner wall of the heating tube (21).

8. A moisture-proof, dust-proof and ventilated active power filter according to claim 7, characterized in that: The temperature detection is a temperature sensor (9), and the temperature sensor (9) is fixedly connected to the inner wall of the installation box (1) through a bracket (8).

9. A moisture-proof, dust-proof and ventilated active power filter according to claim 8, characterized in that: The humidity detection structure is a humidity sensor (23), the humidity sensor (23) is fixedly connected to the outer wall of the air duct (22), and the detection end of the humidity sensor (23) penetrates the outer wall of the air duct (22) and extends into the interior of the air duct (22).

10. The moisture-proof, dust-proof and ventilated active power filter according to claim 9, characterized in that: The dehumidifying particles (18) may be any one of silica gel drying particles and calcium chloride hygroscopic particles.

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